Effect of Heating Rate on Thermoluminescence Glow Curves of
Rare Earth Doped Y2O3 Phosphor
Tarkeshwari Verma1 ,Sadhana Agrawal1
1
Department of Physics, National Institute of Technology Raipur, Raipur-492010, India
09993885860, sagrawal.phy@nitrr.ac.in
Abstract
The present paper reports effect of heating rate on thermoluminescence glow curves of rare
earth doped y2o3 phosphor. Solid state reaction method was used for synthesis of phosphor.
Crystallite size and structure of phosphors were characterized by XRD and morphology by SEM
and FTIR. The crystallite size is found to be 143nm. TL glow curves show, the shifting of the
peaks towards the higher…show more content… Figure 2: FTIR spectra of Y2O3:Sm
+3
doped phosphor.
2.3 Scanning electron microscope (SEM)
Fig. 3 shows SEM images of prepared phosphors for different resolutions. As this figures shows,
the grain size of Y2O3: Sm3+ to be in the range of few microns around 200 nm.The photographs
of the samples show near spherical morphology and uniform agglomeration of the sample.
Figur3 : SEM images of Y2O3:Sm
+3
(0.5mol %) with different resolution
3 Luminescence property
3.1Thermo luminescence study of Y2O3:Sm
+3:-TL is one of the possible ways to estimate the
trap states of the material. The afterglow of any phosphor is generated by the detrapped carriers
that recombine with the opposite carrier in the luminescent center with a transition resulting in
visible region. Y2O3:Sm
+3
doped with Sm
+3
with concentration ratio 0.5 to 2mol%, respectively,
was used to undertake the TL measurements because we observed maximum TL signal strength
at this ratio.
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